Brake-shoe.



nois, have invented certain new and usefulIml lowing is a specification.

efficiency with cheapness of construction.

-f UNITEDSTATES PATENT TOFFIGE vi' AHENRY x. GiLBERT, -oF cHioAGo, ILLINOIS,

BRAKE- No.l 806,251.

i 'To wll'whom it may-concern:

Be it known that I, HENRY K. GILBERT, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illiprovements in Brake-Shoes', of which the fol- The principal object of this invention is the ,production of a brake-shoe which shall com- Io bine the maximum of strength -and jbraking This object I have attained by providing a cast-metal shoe-body exterior with a skeleton of a metal having a diferent texture or degree of hardness from the metal composing said exterior, said'skeleton being firmly embedded in the investing metal of the exterior and made practically integral therewith by forming embedding-openings in the skeleton and casting the metal of the body over said skeleton. To economize the metal ofwhich the skeleton is formed, saidskeleton is made somewhat smaller than the shoe-body and upon its face is provided with transverse ribs extending to and intended to be flush with the face of the nished shoe, so that said face shall be made up of hard and soft metal intervals to increase the braking efficiency of the shoe. lFurther-` more, the skeleton being curved longitudinally and the ribs extending forward from the concave face thereof and being rmly united with the cast metal of the shoe by reason of said cast metal entering the vembeddingholes hereinbefore mentioned, said skeleton forms a trussed arch within said shoe-body, greatly strengthening said shoe. Should said arch be sprung, as by a heavy blow, still the skeleton acts to hold the parts of the body in position to prevent them from falling onto the rail or into the street below inthe case of elevated railways and so that the broken shoe will be nearly as ,eifective in braking as when Whole.

Further objects of the invention will appear in the detail construction hereinafter more fully described. l

In the accompanying drawings, Figure 1 is a longitudinal sectional View taken through the skeleton of this improved brake shoe. Fig. 2 is a similar view showing the body portion investing said skeleton. Fig. 3 is a face view of the shoe, showing portions of the skeleton forming parts of 'said face.

In .the construction of a brake-shoe embody- 55 ing this invention I provide a skeleton l,

Specification of Letters-Patent. f Application nea Jaaury14, 19oa sereine. 241,063.

sms.

' IatentedDec. 1905.

formed of tough metal, ascast-st'eel or other metal softer and having greater tensile strength than the cast-iron of which the body portion of the shoe'is usually formed. This skeleton comprises a web portion 2, longitul .6o dinally curved to conform tothe shape of the finished shoe. Upon its concave face the skeleton 1 has integral. transverse ribs 3, said web portion and said ribs being provided with openings t for the admission of molten iron 65 when the metal to form the body'portion 5' is poured over the skeleton. The ribs also are made thicker at their lower ends to retain the metal of the body of the shoe the more iirmly between'them'.' f v l In forming this shoe the skeleton is placed in the mold in which the body portion is .to be formed 4and molten iron poured into said mold. The liquid iron .fills.the'mold`, sur,-

"roundsthe skeleton 1, and enters the openvals throughout said face.

The body portion 5 of the shoe is of common form and upon its rear side has the usual 8 5 vattaching-loop 6 and at its ends the'usual bearing-shoulders 7 The shoe is attached to the brake-head (not shown) by means of said loop 6, portions Iof said brake-head bearing againstthe. shoulders 7. 90

invention is not' restricted vto the precise4 construction and arrangement of parts herein shown, as such construction and ar-l rangement of parts may be varied by those skilled in the art without departing from the spirit and scope 7of the invention.' Furthermore, it is clear that the skeleton might be made of a strong hard metal instead of a soft malleable metal and the investing body portion be made of soft metal. The combination IOO last'mentioned produces a shoe that will withstand extremely heavy strains and at the same y time offers a face having intervals of'hard and soft metals to increase the coefficient of friction.

I claim as my invention- I 1. A brake-shoe provided with a skeleton comprising a web portion,y said web portion having transverse ribs formed thereon, and f said web portion and ribs being provided with I I0 openings for receiving the metal of the body portion When said metal is in a molten condition.

2. A brake-shoe provided With an integral skeleton comprising a curved web portion extending longitudinally of the shoe, the sides of said Web portion extending substantially parallel With the face of the shoe, said Web portion having transverse ribs extending to the face of the shoe.

3. A brake-shoe having embedded in it an integral skeleton formed from a comparatively soft metal and comprising a web portion provided With ribs, said web portion extending longitudinally of the shoe, and the sides of said Web portion extending substantially parallel With the face of the shoe.

4. A brake-shoe having embedded in it an integral skeleton comprising a web portion and transverse ribs, said web portion lying Wholly Within the shoe-body, and its sides extending substantially parallel with the face of the shoe, said ribs extending to the face of the shoe.

5. A brake-shoe having embedded in it an integral skeleton formed 'from a comparatively soft metal and comprising a web portion extending longitudinally of the shoe, the sides of said Web portion extending substantially parallel with the face of the shoe, said web portion having transverse ribs extending to the face of the shoe.

6. A brakeshoe having a body portion formed of a comparatively hard metal, with an integral skeleton comprising a web portion and ribs on said web portion, said skeleton being formed of a comparatively soft and ductile metal embedded in said body portion, said skeleton being longitudinally curved to con form to the contour of the shoe-body, the sides of said Web portion extending substantially parallel With the face of the shoe, said ribs extending to the Wearing-face of the shoe.

7 A brake shoe having a body portion formed of a comparatively hard metal with a skeleton comprising a web portion and ribs on said web portion,said skeleton being formed of a comparatively soft and ductile metal embedded in said body portion` said web portion and ribs being provided with openings to receive the molten metal of which the body portion is formed, said ribs extending to the wearing-face of the shoe.

HENRY K. GILBERT.

Witnesses:

C. M. CONNELL, GEORGE L. CHINDAHL. 

